WatchMon-CORE kit for CellMate-K9

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WatchMon-CORE with CellMate-K9

CellMate-K9 for Share balancing wiring (3 - 16s)

Choose the options to go with your WatchMon CORE

CellMate-K9  is our new monitor capable of monitoring batteries between 3s and 16s

  • Individual cell monitoring
  • Balancing your battery pack to keep them safe
  • 3s to 16s with a single CellMate-K9
  • Many CellMate-K9 can be daisy-chained to grow your system.
  • High Voltage by combining CellMate-K9s to get to your desired configuration.
  • Parallel banks or Multi-string with one CellMate-K9 per bank.
  • Suitable for use with OEM Shared loom batteries
  • Capable of measuring 0.50 to 5.00V per cell
  • Designed with Lithium batteries in mind. 
  • Suitable for all types of Lithium batteries including NCA, NMC, LMO, LFP and LTO
  • 4 temperature sensors to measure cell temperature
  • Mounting holes to enable addition of 60mm fan to boost balancing performance
  • Simple, robust design
  • One CellMate-K9 can measure a single bank or part of a larger bank
  • Pluggable connectors for easy wiring.
  • Communicates with new WatchMon CORE to give you maximum control.
  • Using WatchMon Toolkit is very configurable and powerful

Support Content



WatchMon CORE 

Introducing the next generation of WatchMonCORE supervisor. We have made a new model, a stronger WM4...a better 4... now shall be named "WatchMon-CORE". This revamp is taking the lessons we have learnt from WM4 and building on this proven platform with a few new features.  Moving forward this will be the CORE building block that additional components will link to this supervisor in the future. 


  • Versatile Supervisor works with both distributed and centralised cell monitors
  • User-configurable parameters and control logic
  • Configurable 30vdc 5A relay  (i.e. remote circuit breaker trip, contactor or fan)
  • Additional inputs/outputs via Expansion Board purchased separately
  • Compatible with all Expansion Board (series 1, 2, or 3)
  • Clock with a backup battery
  • data logging of key metrics for 10 years
  • firmware upgrades via USB
  • 4 stage display of State of Charge (SoC%) 
  • External ambient temperature sensor
  • Easy to use pluggable screw-terminal connectors
  • Link to Shuntmon with 500A or 1000A power rating 

Remote Communication

  • WiFi connectivity (normal, disabled, or read-only)
  • CAN bus Opto-Insulated to remote charger/inverter equipment
  • future feature to connect to the cloud portal via MQTT (secure link).

 Power Input

  • Built-in 8v to 65v DC-DC supply
  • with WiFi-enabled consumes ~1.7W (Typical 48v battery budget 1Ah/day)

    Optional Extras that can be purchased

    • TestMon - checks and confirms your wiring
    • Expansion board
    • 500A or 1000A Shunt monitor
    • TestMon16
    • Extra Support - email fair use is included free but if you need more help you can buy upfront or later on an as-needed basis via Zoom or similar.


    Optional Expansion Board (series 3) details

    • 3 x Mechanical 30Vdc 5A relay outputs
    • 3 x Solid state relay SSR 65vdc 5A isolated modules outputs
    • 2 x Isolated inputs 5-65vdc sensor channel
    • 2 x ADC 0-5vdc (future development option)
    • 1 x RS485 Serial port (future development option)
    • 1 x Remote Addressable LED (future development option)
    • Compatible with all supervisors


      Mounting a Fan

      CellMate-K9 has been designed to allow a 60mm Fan to be mounted to enhance balancing performance if the customer desires. 

      *Fan and standoffs are not supplied.

      • M3 screws to mount Hex standoffs to the CellMate-K9
      • Standoffs should be 30mm height in order to clear the heat sink.
      • Fan hole centers are 60mm apart.
      • Fan power can be triggered by the logic of the WatchMon CORE 
      • Adopt one of the Relay/SSR to switch the fan power.
      • Fan selection is a customer choice, Voltage (12,24,48,5V) etc.
      • The fan is not to be powered from the onboard 5V DC-DC of the WatchMon CORE

      Helicopter preview of the product with optional Expansion Board 3

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